The first sign at a highway-rail intersection that a driver typically encounters is the advance warning sign.
What is the sign for
This sign is placed in advance of the railway tracks to alert drivers about the upcoming railroad crossing. It serves as a cautionary warning, prompting drivers to be prepared to slow down and be aware of the potential presence of a train crossing the road.
The advance warning sign often features a round yellow background with a black "X" symbol, indicating a railroad crossing. Sometimes, it may also include additional signage indicating the number of tracks and/or an advisory speed limit to ensure safe crossing.
Question
What is The first sign, driver sees, when approaching a highway rail intersection